Cursor for loop in Oracle

Question

Please, explain me how to use cursor for loop in oracle.

If I use next code, all is fine.

for rec in (select id, name from students) loop
    -- do a         


        

Answer 1

You're not executing that sql string anywhere. Simply do this

v_sql := 'select id, name from students';
open cur for v_sql;
for rec in cur loop
    -- do anything
end loop;

Or you can do this

cursor cur is select id, name from students;
open cur;
for rec in cur loop
        -- do anything
end loop;

Or you can do this

for rec in (select id, name from students) loop
    -- do anything
end loop